Hawg is correct in the historical aspect. The modern offerings in 45Colt are neat though and I like mine just because it means only one caliber to carry for both rifle and handgun. The 44/40 is a pain to load comparativley but does have an advantage as that bottle neck case seals the chamber better from blowback in to the action with moderate black powder loads. If black powder is what you shoot it is something to consider.